Is red hair dominant over black hair? Or is red hair recessive?

red hair recessive or dominant image

Answer Man

I need to draw a Punnett square showing homozygous red hair crossing with heterozygous black hair. But I need to know which hair colour is dominant/recessive!

Answer
B b
b Bb bb

b Bb bb

red is recessive

black dominant

Red hair and recessive and dominant genes?

Q. I am confused about the facts about the recessive and dominant genes in red hair. I have had people tell me that red hair is a recessive trait, and both sides have to carry it for it to show up. I have also had people tell me that it skips a generation. I just want to know the facts so that when my child is born and it doesn't have the same dark red hair as my husband people, his mother mostly, who is convinced it's going to be a red haired child, can be set straight about the about the whole thing. Thanks.

Answer
"Red hair is not actually a recessive gene (like blonde is), but is rather an "incomplete dominant." In the world of genes, there are dominant genes, which take over any recessive gene (brown, black), recessive genes (blonde), which will be taken over by any dominant gene, or incomplete dominent genes (red). Incomplete dominant genes will "blend" with any dominant, recessive or other incomplete dominant gene. I, for example, have "auburn" hair, which is essentially red blended with brown. Strawberry blondes are red blended with blonde.

So you've got yourself a red headed parent (let's call those genes aa) and a blonde parent, which we'll represent as bb. 100% of the offspring will have one hair color gene from each parent, or ab. This means red and blonde. Since red will always blend with other genes, the resulting hair color should be a blend of blonde and red, or strawberry blonde. In the case of my parents, which both have brown hair (let's call the brown/black genes C), either one parent or possibly both are carrying one "a" in addition to their brown or black genes, with the possibility of even a blonde thrown in (CC, Cb, or Ca). My parents are probably (Ca, CC). I'm probably a Ca, or a blend of brown and red. This result has an outcome likelihood of 50%."

this is from http://www.science.ca/askascientist/viewquestion.php?qID=960

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